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Fig. 1 | Egyptian Journal of Radiology and Nuclear Medicine

Fig. 1

From: Role of endoanal ultrasound in the assessment of perianal fistula in correlation with MRI fistulography

Fig. 1

a, b MRI axial T2 and STIR WI images showing two fluid filled intersphincteric fistulous tracts eliciting high signal and abutting the internal sphincter at 1 o'clock (yellow arrows) and 6–7 o'clock (red arrows). c Coronal T2 MRI WI images showing left intersphincteric fluid filled fistulous tract (blue arrow). d Ultrasound images show a hypoechoic fistulous tract seen within the left anterior intersphincteric space abutting the internal anal sphincter (internal opening) opposite 1 o'clock (yellow arrow). e Another hypoechoic fistulous tract seen within the right posterior intersphincteric space abutting the internal sphincter opposite 6–7 o'clock (Red arrow). (f) Ultrasound coronal images show left short intersphincteric fistulous tract breaching the internal sphincter at the level of the superficial portion of the external sphincter (blue arrow)

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